# Zebra v4.4.0 still accepts V5 SIGHASH_SINGLE without a corresponding output

Source: https://junglewise.ai/threats/zebra-v4-4-0-still-accepts-v5-sighash-single-without-a-corresponding-673d508e  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-08  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 4 · Published 2026-05-08

Zebra v4.4.0 still accepts V5 SIGHASH_SINGLE without a corresponding output

Technologies: [zebra-script (crates.io)](https://junglewise.ai/threats/technologies/zebra-script), [zebrad (crates.io)](https://junglewise.ai/threats/technologies/zebrad). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Medium severity, with a CVSS score of 4, published 8 May 2026.

**Which products and versions are affected?** zebra-script (crates.io) SEMVER:introduced=0,fixed=6.0.1; zebrad (crates.io) SEMVER:introduced=0,fixed=4.4.1.

**Is there a fix for This vulnerability?** Yes. zebra-script (crates.io): upgrade to 6.0.1 or later; zebrad (crates.io): upgrade to 4.4.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run zebra-script (crates.io) or zebrad (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- zebra-script (crates.io): upgrade to 6.0.1 or later

  ```sh
  cargo update -p zebra-script
  ```

- zebrad (crates.io): upgrade to 4.4.1 or later

  ```sh
  cargo update -p zebrad
  ```


## Affected products

- zebra-script (crates.io) SEMVER:introduced=0,fixed=6.0.1
- zebrad (crates.io) SEMVER:introduced=0,fixed=4.4.1

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- [ZcashFoundation Zebra denial of service via balance overflow in state writer](https://junglewise.ai/threats/cve-2026-52738-zcashfoundation-zebra-denial-of-service-via-balance-overflow-in)
- [Zcash Zebra sync restart poisoning via above-lookahead block](https://junglewise.ai/threats/cve-2026-52737-zcash-zebra-sync-restart-poisoning-via-above-lookahead-block)
- [ZcashFoundation Zebra block suppression via same-header body poisoning](https://junglewise.ai/threats/cve-2026-52736-zcashfoundation-zebra-block-suppression-via-same-header-body)